Furaptra, Tetrapotassium Salt

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Mag-Fura-2 is a UV-excitable fluorescent indicator for magnesium with a K_d of 1.9 mM. Similar to Fura-2, the excitation wavelength of Mag-Fura-2 undergoes a blue shift from 369 nm to 330 nm. Mag-Fura-2 also responds to Ca² but with a significantly lower K_d than Fura-2 for Ca² . An important application of Mag-Fura-2 is its use in detecting high, transient Ca² concentration during Ca² spikes. Mag-Fura-2/tetraammonium salt can be loaded into cells by microinjection or scrape loading. Also see Mag-Fura-2, tetrasodium salt and the cell membrane-permeant Mag-Fura-2 AM ester. 

 
• Light yellow solid soluble in water (pH > 6)
 
• Store at -20°C and protect from light
 
• C₁₈H₁₀K₄N₂O₁₁
 
• MW: 587
 
• [132319-57-4]